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2. Telechron - Wikipedia

   en.wikipedia.org/wiki/Telechron

   The electric clock market grew rapidly in the 1930s, and Telechron's patented power interruption indicator gave his clocks an advantage over competing synchronous clocks, but by the 1950s battery-operated clocks that weren't dependent on the power grid took market share, and in the 1960s the quartz clock replaced synchronous clocks.

3. Simon Willard - Wikipedia

   en.wikipedia.org/wiki/Simon_Willard

   Additionally, he oversaw Harvard's management of its clocks. Willard presented two clocks to Harvard. One was a tall-case clock; the other was a wall-mounted regulator clock that was installed in a room near University Hall. A particular incident relates to Harvard's Great Orrery which was malfunctioning. Many craftsmen had unsuccessfully ...

4. Clock - Wikipedia

   en.wikipedia.org/wiki/Clock

   The electric clock was patented in 1840, and electronic clocks were introduced in the 20th century, becoming widespread with the development of small battery-powered semiconductor devices. The timekeeping element in every modern clock is a harmonic oscillator, a physical object that vibrates or oscillates at a particular frequency. [2]

5. Electric clock - Wikipedia

   en.wikipedia.org/wiki/Electric_clock

   These keep time by counting the oscillations of a calibrated tuning fork with a specific frequency. These were only made in battery-powered form. Battery-powered clocks have been made using the schemes above with the obvious exception of a synchronous movement. All battery-powered clocks have been largely replaced by the lower cost quartz movement.

6. Kit-Cat Klock - Wikipedia

   en.wikipedia.org/wiki/Kit-Cat_Klock

   The words "Kit-Cat" were added to the clock's face in 1982. The original clocks were AC-powered, but due to scarcity of American-made AC motors, the clock was redesigned for battery power in the late 1980s. [3] The manufacturer estimates that an average of one clock has been sold every three minutes for the last 50 years. [4]

7. History of timekeeping devices - Wikipedia

   en.wikipedia.org/wiki/History_of_timekeeping_devices

   The 12th-century Jayrun Water Clock at the Umayyad Mosque in Damascus was constructed by Muhammad al-Sa'ati, and was later described by his son Ridwan ibn al-Sa'ati in his On the Construction of Clocks and their Use (1203). [45] A sophisticated water-powered astronomical clock was described by Al-Jazari in his treatise on machines, written in ...